Initial revision

From-SVN: r26263

libjava/java/lang/w_sqrt.c

@@ -0,0 +1,93 @@
+
+/* @(#)w_sqrt.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice 
+ * is preserved.
+ * ====================================================
+ */
+
+/*
+FUNCTION
+	<<sqrt>>, <<sqrtf>>---positive square root
+
+INDEX
+	sqrt
+INDEX
+	sqrtf
+
+ANSI_SYNOPSIS
+	#include <math.h>
+	double sqrt(double <[x]>);
+	float  sqrtf(float <[x]>);
+
+TRAD_SYNOPSIS
+	#include <math.h>
+	double sqrt(<[x]>);
+	float  sqrtf(<[x]>);
+
+DESCRIPTION
+	<<sqrt>> computes the positive square root of the argument.
+	You can modify error handling for this function with
+	<<matherr>>.
+
+RETURNS
+	On success, the square root is returned. If <[x]> is real and
+	positive, then the result is positive.  If <[x]> is real and
+	negative, the global value <<errno>> is set to <<EDOM>> (domain error).
+
+
+PORTABILITY
+	<<sqrt>> is ANSI C.  <<sqrtf>> is an extension.
+*/
+
+/* 
+ * wrapper sqrt(x)
+ */
+
+#include "fdlibm.h"
+#include <errno.h>
+
+#ifndef _DOUBLE_IS_32BITS
+
+#ifdef __STDC__
+	double sqrt(double x)		/* wrapper sqrt */
+#else
+	double sqrt(x)			/* wrapper sqrt */
+	double x;
+#endif
+{
+#ifdef _IEEE_LIBM
+	return __ieee754_sqrt(x);
+#else
+	struct exception exc;
+	double z;
+	z = __ieee754_sqrt(x);
+	if(_LIB_VERSION == _IEEE_ || isnan(x)) return z;
+	if(x<0.0) {
+	  exc.type = DOMAIN;
+	  exc.name = "sqrt";
+	  exc.err = 0;
+	  exc.arg1 = exc.arg2 = x;
+	  if (_LIB_VERSION == _SVID_)
+	    exc.retval = 0.0;
+          else
+            exc.retval = 0.0/0.0;
+          if (_LIB_VERSION == _POSIX_)
+            errno = EDOM;
+          else if (!matherr(&exc)) {
+            errno = EDOM;
+          }
+          if (exc.err != 0)
+	    errno = exc.err;
+	  return exc.retval; 
+	} else
+	    return z;
+#endif
+}
+
+#endif /* defined(_DOUBLE_IS_32BITS) */